在.gradlew命令行构建中找不到dokka？

Question

我正在尝试构建一个项目，它使用：https://github.com/Arasthel/SpannedGridLayoutManager

当我运行./gradlew --assemble时，我得到：

1: Task failed with an exception.
-----------
* Where:
Build file '/path/to/SpannedGridLayoutManager/spannedgridlayoutmanager/build.gradle' line: 3

* What went wrong:
A problem occurred evaluating project ':spannedlm'.
> Plugin with id 'org.jetbrains.dokka-android' not found.

* Try:
Run with --stacktrace option to get the stack trace. Run with --debug option to get more log output. Run with --scan to get full insights.

这是SpannedGridLayoutManager/spannedgridlayoutmanager/build.gradle

apply plugin: 'com.android.library'
apply plugin: 'kotlin-android'
apply plugin: 'org.jetbrains.dokka-android'

task dokkaJavadoc(type: org.jetbrains.dokka.gradle.DokkaAndroidTask) {
    delete "$rootDir/docs"

    outputFormat = 'html'
    outputDirectory = "$rootDir/docs"

    externalDocumentationLink {
        url = new URL("https://developer.android.com/reference/")
    }

    includeNonPublic = false

    // Always recreate documentation
    outputs.upToDateWhen { return false }
}

afterEvaluate {
    if (project.hasProperty("javadocJar")) {
        tasks.javadocJar.dependsOn dokkaJavadoc
    }
}

ext {
    bintrayRepo = 'maven'
    bintrayName = 'spannedgridlayoutmanager'

    publishedGroupId = 'com.arasthel'
    libraryName = 'SpannedGridLayoutManager'
    artifact = 'spannedgridlayoutmanager'

    libraryDescription = 'A layout manager that will resize and reorder views based on a provided SpanSize.'

    siteUrl = 'https://github.com/Arasthel/SpannedGridLayoutManager'
    gitUrl = 'https://github.com/Arasthel/SpannedGridLayoutManager.git'

    libraryVersion = '3.0.2'

    developerId = 'Arasthel'
    developerName = 'Jorge Martín Epsinosa'
    developerEmail = 'jorgemartinespinosa@gmail.com'

    licenseName = 'MIT'
    licenseUrl = 'https://opensource.org/licenses/MIT'
    allLicenses = ["MIT"]
}

android {
    //compileSdkVersion 28
    compileSdkVersion 29
    buildToolsVersion buildtools_version

    defaultConfig {
        minSdkVersion 14
        //targetSdkVersion 28
        targetSdkVersion 28
        versionCode 1
        versionName libraryVersion
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

tasks.withType(Javadoc) {
    excludes = ['**/*.kt']
}

dependencies {
    implementation "com.android.support:recyclerview-v7:$support_library_version"
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
}

// Bintray Upload
apply from: '../gradle/tools/bintrayv1.gradle'
apply from: '../gradle/tools/installv1.gradle'

这是SpannedGridLayoutManager/build.gradle

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    //ext.kotlin_version = '1.3.10'
    ext.kotlin_version = '1.3.61'
    ext.support_library_version = '28.0.0'
    //ext.dokka_version = '0.9.17'
    ext.dokka_version = '0.9.18'
    ext.buildtools_version = '28.0.3'
    repositories {
        jcenter()
        google()
    }
    dependencies {
        //classpath 'com.android.tools.build:gradle:3.2.1'
        classpath 'com.android.tools.build:gradle:4.0.1'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath "org.jetbrains.dokka:dokka-android-gradle-plugin:$dokka_version"

        classpath 'com.jfrog.bintray.gradle:gradle-bintray-plugin:1.8.4'
        classpath 'com.github.dcendents:android-maven-gradle-plugin:2.1'
    }
}

allprojects {
    repositories {
        jcenter()
        google()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

我需要做些什么才能让它正常工作？

旁白-这看起来像是某个插件，gradlew不能从它的存储库中在线检索。

对于给定的配置，是否有一个命令可以查看gradlew可见的所有可用插件？像apt-show-versions -R -a这样的东西会列出apt在Debian中可用的所有包吗？

Answer 1

嗯，在读了一点Custom Gradle Plugin ID not found之后，我想我已经弄明白了。

问题是-我可以用./gradlew assemble构建SpannedGridLayoutManager；但我得到的错误消息是在我将其构建为依赖项目时特别出现的。

问题是:当我独立构建SpannedGridLayoutManager时，首先会调用SpannedGridLayoutManager/build.gradle，并在buildscript的dependencies中定义classpath-然后在SpannedGridLayoutManager/spannedgridlayoutmanager/build.gradle时，插件ids会根据前面定义的classpath进行解析。

当我构建我的项目时，当然首先运行MyProject/build.gradle --但是它没有相同的classpath集；所以当MyProject/../SpannedGridLayoutManager/spannedgridlayoutmanager/build.gradle作为依赖项目被处理时，类路径没有被定义，插件查找失败。

所以在我的项目中，我基本上必须在build.gradle中添加这两行-这里显示为diff：

$ git diff build.gradle
diff --git a/build.gradle b/build.gradle
index b730fda..6a696c9 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,5 +1,6 @@
 buildscript {
     ext.kotlin_version = "1.4.0"
+    ext.dokka_version = '0.9.18'
     repositories {
         google()
         jcenter()
@@ -10,6 +11,7 @@ buildscript {
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         classpath "com.android.tools.build:gradle:4.0.1"
         classpath "com.jfrog.bintray.gradle:gradle-bintray-plugin:1.8.4"
+        classpath "org.jetbrains.dokka:dokka-android-gradle-plugin:$dokka_version"
     }
 }

当然，这两行代码是从原始构建文件SpannedGridLayoutManager/build.gradle完全复制过来的。

嗯，很高兴解决了这个问题--但如果有更好的错误消息，那就更好了(或者甚至，如果./gradlew --debug会说一些像searching classpaths for ...这样的话，然后把它看起来和找到的所有东西都倒掉)。